Triple-valve device



Nov, ll 1924. v 1,514,690

C. C. FARMER TRIPLE VALVE DEVICE Filed sept. 15, 1922 z sneensfsneen 1 |NvENToR CLYDE C. FARMER ATTORNEY Nov. 1924. 1,514,690

C. C. FARMER TRIPLE VALVE DEVICE Filed Sept. 13, 1922 2 Sheets-Sheet 2 26 x' 25 HHN nfl WWU i 29 a r- 2 30 T a 4a f5 .n I7 2a d rg/ s A 2 I AI :E

a4- A 2 4o INVENTOR CLYDE C. FARMER vATToFaNEY erated v'by piston 24. The usual tail port fn the main slide valve 27 through which ."fiuid is supplied from the auxiliary reser-y yoir to the brake cylinder in an emergency Aapplication is plugged, if my Vimprovement is applied to an existing triple valve device, or is omittedin a new triple valve construction. f l

' In operation, the valve chamber 25 and the auxiliary reservoir 26 are charged with fluid under pressure vfrom the brake pipe through the usual feed groove 31 and brake pipe pressure acting on the exposed area of pisto-n 16 lifts same from its seat, so that Huid from the. brake pipe flows into chamber 14. When the chamber 14 has been charged to brake pipe pressure, less the tension of sprin 20, the piston 16 again seats.

The vent va ve 18 is'held seated by theA emergency position, asl shown in Fig. 2, so

.that the main slide valve 27 'uncovers a port 29 leading to the emergency piston chamber 3Q. Te emergencypiston 6 then moves to its seat 8 and the check valve 10 se-ats in the piston 6. The movement .of piston '6 opens the emergency valve 9 so that fluid in chamber 14 is vented to the brake cylinder 32 through pipe 33. The brake pipe pressure acting on the under side of the piston 16 then operates to unseat the piston, permitting iuid to be vented from the brake pipe .to the brake cylinder.l

` en the piston 16"'has moved suiiiciently to take up the lost motion between the stem y 17 and the vent valve 18., the vent valve will be opened by the further movement of the iston, so that fluid isV vvented from the brake pipe to passage 34 which is open to the atmosphere, assuming, ior the moment, that the valve mechanism contained in the casing 35 is not employed. A plurality of by-pass grooves 36 are provided in the casing 5,vvhich are so positioned, that communication is opened through the grooves around the piston `16 just as the vent valve 18 unseats, so thaft brake pipe pressure will be simultaneously vented to the brake cylinder and tc the atmosphere andl thus an excessive ow to the brake cylinder will be prevented. In this mannelya quick inshot of pressure from the brake pipe into the brake cylinder is effected vas Well as a rapid discharge of brake vpipe pressure directly to the latmosphere.

The quick inshot of'iuid under preure into the brake cylinder is' sufficient to move the brake cylinder piston and the connected brake rigging to application position and sure in chamber 14 4and in the brake cylin-y der, the piston 16 will moveto its seat 15, A

thereby cutting off communication from the brake pipe to the brake cylinder. The movement of the piston 16 to its seat permits the vent valve 18 lto seat so lthat furtherventing of fluid from the brake pipe to the at- .mosphere is cut oi.- v

While the above action is taking place, fluid under pressure is slowly fiowing from the auxiliary reservoir to the brake cylinder through the restricted port 13 in the check valve 10, said check Avalve being seated at this .time and when the brake cylinder pressure been increased by flow through the restrlcted port 13 to a point Iat Whichqthe brake cylinder pressure plus the pressure of spring llslightly exceeds the reduced auxiliary reservoir pressure acting in piston Vchamber 30, the check valve 10 will be un- Upon substantial equalization of the aux-` iliary reservoir pressure actin on one -side of -the emergency .piston 6 with the brake cylinder vpressure acting on the opposite side7 the spring 20 will move the valve .9.

and the sitions.

If an emergency reduction in brake pipe pressure be kmade after a service application of the brakes, the valve 9 will be opened, and iiuid will be'vented from chamber 14 to the brake cylinder and the piston 16 will be operated to open the vent valve 18 as hereinbefore described, 'but since the brake cylinder pressure has already vbeen built up to a cer-tainfpoint due to the previous service application of the brakes, aqualization of' pressures on opposite sides of the piston 16 may take place and vent `valve 18 may then close by reasonv of the piston 16 moving to its'seat before the brake pipe pressure has been reduced to the low degree desired to ensure adequate quick serial action throughout the train. i

In order to ensure .that the vent valve 18 will remain open under the, above circumstances until the brake pipe pressure has been reduced to the desired lowpoint I may provide a valve device such as that shown incorporated in the casing 35.`

Said casing is applied to the V.triple valve piston 6 to their normal closed poportion 5 and has a chamber 37 which conL l is adapted to vopen communication from.

chamber 36-to a plurality of ports 41 which are open to 'the'atmosphere In the operation of this feature of my invention, when the vent valve 18 is lifted from its seat upon an emergency reduction in brake pipe pressure, fluid from the brake' pipe is admitted to the chamber 37 and acts on the under side of piston 39. Since the opposite side of the piston is at atmospheric pressure, the pist0n is moved upwardly by brake pipe pres# sure, the stem 40 following the movement of vent valve 18. f-

The vent valve 18 will now lbe held unseated by the stem 40 and piston 39, although the piston 16 may in the meanwhile move to its seat as hereinbefore described, until the brake pipe pressure has been reduced lto substantially atmospheric preure by flow through the ports 41, which are uncovered by 'the upward movement of the piston-39. The piston 39 will then return to its normalV position, permitting the vent valve 18.to seatl Quick serial venting of brake pipe pressure to vthe brake cylinder in service applications is provided for bylextending the usual quick service ventfport 42 through the cas` ing Section5 so that said port opens in the When a service application of the brakes is made, the triple valve parts move toward service position and the vent port 42 'is connected to the brake cylinder through port 43, kcavity'44 in the graduatin valve 28, and

port 45 to emergency piston c amber 30 -ani` thence through 'the ports 12 around the check valve 10 to the brake cylinder 32. The venting of pressure in the space below piston. 16 outside the seat 15, causes a dow ofi luid from chamber 14 through a restricted port 46 inthe piston 16 to the brake cylinder by way of the vent port 42, so that the higher brake pipe pressure acting on the inner seated area of the pistonrl operates to lift the piston from its seat, thereby establishingV communication from the brake pipe to the brake cylinder,so that ay quick serial venting' of the brake pipe in a service application is effected.

Due to the lost motion between the stem 17 and the vent valve 18, the piston 16 can lift suiiiciently to secure the quick service venting from the brake pipe without moving the vent valve 18, and without opening communication from the brake pipe to the chamber 14. i

Having now described my invention, what I claim as new and desire to secure by Letr4ters Patent, is

- l. In a fluid pressure brake, the combina- ,plied from the auxiliary reservoir to tion with a brakecylinder, auxiliary reser-y voir,'and brake pipe, of a valve movable by, r

means operated upon a sudden reduction in brake, pipe pressure for supplying duid frolnthe auxiliary reservoir to said valve.

2. In a iluid pressure brake, the combination with a ybrake cylinder, auxiliary reservoir, and brake pipe, of valve means operlatedv by auxiliary reservoir pressure for closing a communication through which fluid is' sup lied from the auxiliary reservoir to the braEe cylinder, an `always open restricted port through which duid is su lied from `the auxiliary rescrvior to t e rake cylinder, and means operated upon a sudden reduction in brake pipe pressure for supplying fluid from the auxiliary reservoir to saidV valve means, yandethrough said restricted port to the brake cylinder.

3. VIn a fluid pressure brake, the combinaf tion with a brake cylinder, auxiliary reservoir, and brake pipe, of valve means. operated by auxiliaryreservoir pressure for closing a communication from' the auxiliary reservoir to the brake cylinder and subject on one side to brake cylinder pressure and the pressure of a spring and means operated' uponasudden reduction in brake .pipe presreservoir to said valve means and through a restricted port to the brake cylinder.

4.- In a fluid ressure brake, the combination with a b ra e cylinder, auxiliary reservoir, and brake pipe, of a valve subject on one side to brake cylinder pressure .and the pressure of a spring for controlling a communication through which luid is supplied from the auxiliary reservoir to the brake cylinder and means operated upon a 'sudden' reduction in brake pipe pressure for'supplying fluid from the auxiliary reservoir toV the lopposite side ofy said valve and through a restricted port to the brake cylinder.

' l5. In a Huid pressure brake, the combina tion with a .brake cylinder, auxiliary reservoir, and brake pipe, oij means subject to the opposing pressuresf of the auxiliary reservoir `and..VV brakek Vcylinder and operated by ico -auxiliary reservoir ressure in an emergency applicationo the rakes for firsty closing a communication through which fluid is su f e brake cylinder and then operated upon a predetermined increase in brake cylinder A ressure above the pressure at which brake pipe and the brake cylinderare adapte` ed to equalize for opening .said conimunica tion.

. 6. Ina fluid ressure brake, thecombina, tion with va bra e cylinder, auxiliary reserf voir, and brake pipe, of avalvev subject4 on one side to auxiliary reservoir pressure and on the opposite side to brake cylinder pressure and the pressure kof a spring for controlling a communication through which Huid is supplied from the auxiliary reser-y voir to the brake cylinder in an emergency application of the brakes.

7. In a fluid pressure brake, the combination with a brake cylinder, auxiliary reservoir, and brake pipe, of an emergency piston and a valve in said piston for controlling a communication through which fluidis supplied from the auxiliary reservoir to the brake cylinder and means operated upon a sudden reductionin brake pipe pressure for supplying fluid from the auxiliary reservoir to saidk valve for operating the va ve to close said communication. p

8. In a fluid pressure brake, the combination with ay brake cylinder, auxiliary reserlvoir, and brake pipe, of an emergency piston and a valve in said piston subject lon one .side to brake cylinder pressure for controll 'ing a communication through which fluid is supplied from the auxiliary reservoir to the brake cylinder and means operated upon va sudden reduction in brake pipe pressure for supplying `fluid from the auxiliary resernation with a brake cylinder, auxiliary-reservoirNand brake pipe, of. a casing having a piston chamber, an emergency piston insaid chamber, a vvalve mounted in said., iston and subgectonfone side to brake cy inder.

'jv-.pressure and the pressure of a spring, and v means operated uponv a sudden reductionl in brake pipe pressure for supplying fluid from the auxiliary reservoir to said chamber, and

through a restricted port in said valve to the bra-ke cylinder.

11. In a fluid pressure brake,l the combination withv a brake cylinder, auxiliary reservoir, and brake-pi e, 4of a casing having a piston chamber, a ushing mounted said chamber, a piston cylinder mounted insaid bushing, an emergency pistonin saidcy'linder, a valve mounted f-nsai'd piston for con-v trolling a communication from the auxiliary reservoir to the brake cylinder, and means operated upon a sudden reduction in brakev pipe pressure for supplying fluid from the auxiliary reservoir to said piston and valve.;

12. In a fluid pressure brake, the combination with a. triple valve casing having' an.'

emergency piston chamber, of a asket mounted in said chamber, a piston cy inder engaging saidy gasket to prevent rleakage of fluid around said cylinder, and an emergency piston mounted in said cylinder.

13. In a fluid pressure brake, the combination with a triple valve casing having .an emergency piston chamber, of la gasket mounted in said chamber, a piston cylinder seating on said gasket, and an emergency piston mounted in said cylinder.

14. In a fluid pressure brake, the combination witha triple valve casing having an emergency piston chamber, a gasket-mount'- ed in-said chamber and having an inclinedA seating face, a piston cylinder mounted in said chamber and having a corresponding inclined face engaging the inclined :face of the gasket, and an emergency mounted in said) cylinder.

y15. In a fluid pressure brake, the combil`in. said valve chamber for controlling communication from the brake pipe to the brake cylinder, and a vent valve operated by said valve means for venting fluid from the brake pipe to the atmosphere.

los

y. 17. In a fluid pressure brake, the combi-.

nation with a triple valve-casing having an emergency piston chamber, an emergency piston in said chamber, means associated Witln saidfpiston for controlling the supply of fluid from 'the auxiliary reservoir to the brake cylinder, a valve chamber, valve means in said chamber for controlling communication from' the brake pipe to the brake cylinder, a vent valve operated by said valve means for venting fluid from the brake Vpipe tothe lbrake cylinder, andan emergency valve' operated, by4 said emergency piston forventing fluid from said valve chamber. to effectthe operation of said valve means.

18. Ina fluid pressure brake, the combination with a'brake pipe, of a vent valve operated upon a sudden reduction in brake pi e pressure for venting fluid from the braEe pipe to Vthe atmosphere, and an auxiliary device for maintaining said vent valvefin its open position.

19. In a fluid pressure brake, the combination r with a-'brake pipe, of a vent valve operated upon a sudden reduction in brake pipe pressure for' venting fluid from the brake pipe to the atmosphere, a iston subject to the opposing ressures o; the brake pipe and the atmosp 1ere and means operated by said piston for maintaining said vent valve in its open position.

20. In a fluid pressure brake, the combination with a brake pipe, of a vent valve operated upon 'a sudden reduction in brake pipe pressure for venting fluid from the brake pipe to the atmosphere, a piston subject on one side to fluid vented from the brake'pipe upon the opening of said vent valve and on the opposite side to the atmospheric pressure, and a. stem operated by said pistonv and adapted to engage said vent valve.

21. In a fluid pressure brake, the combination with a brake pipe, of a vent valve operated upon a sudden reduction in brake pipe pressure for venting fluid from the brake pipe to the atmosphere, a piston subject on one side to lluid vented from the brake pipe upon the opening ofv said vent valve and on the opposite side to the atmospherie pressure yand operated by brake pipe pressure for opening communication from the brake pipe to the atmosphere, and means operated by said piston for maintaininf said, vent valve in its open position.

22. In a fluid pressure brake, the combi-v nation with a brake pipe, of a vent valve operated upon a sudden reduction in brake pipe pressure for venting fluid from the brake pipe to the atmosphere and means operated by the flow of fluid from the brake pipe upon t-he opening of said vent valve for maintaining said vent valve in its open position.

23. In a fluid pressure brake, the combination with a brake pipe, of a vent valve operated upon a sudden reduction in brake pipe pressure for venting fluid from the brake pipe to the atmosphere and means operated by the flow of fluid from the brake pipe to the atmosphere upon the opening of said .vent valve for maintaining said vent valve in its open position.

24. In a fluid pressure brake, the combination with a brake cylinder, brake pipe, and a triple valve device having means for venting fluid from the brake pipe to the brake cylinder in a service application of the brakes and including a quick service port, of a vent valve for venting fluid from the brake pipe, and a piston operated upon a sudden reduction in brake pipe pressure for operating said vent valve Iand adapted to control communication from the brake pipe to said quick service port.

25. In a fluid pressure brake, the combination with a b-rake cylinder, brake pipe and a triple valve device having means for venting uid from the brake pipe to the brake cylinder in a service application of the brakes and including a quick service port, of a vent valve for venting fluid from the brake pipe, and a piston operated upon a sudden reduction in brake pipe pressure for operating said vent valve and having a movement relative to said vent valve Jfor opening communication from the brake pipe to said quick service port.

26. In a fluid pressure brake, the combination with a brake cylinder, brake pipe, and a triple valve device having means for ventin Huid, from the brake pipe to the brake cy inder in a service application of the brakes and including all quick service port, of a vent valve for venting fluid from the brake pipe, and a pistonhaving a movement relative to said vent valve for opening communication .from the brake pipe to said quick service port and adapted upon a further movement to open said vent valve.

27. In a iluidY pressure brake, the combination With a bra-ke cylinder, brake pipe, and a triple valve device having means for venting fluid from the brake pipe to the brake cylinder in a service applio'ation of the brakes and including a quick service port, of a vent valve for venting fluid from the brake pipe, and a piston having a movement relative to said vent valve for opening communication from the brake pipe to said quick service port and adapted upon a fur ther movement to open said vent valve and also establish oo-mmunication from the brake pipe to the brake cylinder.

In testimony whereof I have hereunto CLYDE C. FARMER.

`set my hand. 

